Evaluation of wear properties of Al7075/SiC-BN hybrid nano-composite surface layer produced by friction stir processing

Subject Areas :

Mahmoud Soleymani ¹ , Seyed Farshid Kashani Bozorg ² , AliMohamad Hadian ³

1 - دانشجوی کارشناسی ارشد، دانشکده مهندسی متالورژی و مواد، پردیس دانشکده‌های فنی دانشگاه تهران
2 - دانشیار، قطب علمی مهندسی سطح و حفاظت از خوردگی در صنایع، دانشکده مهندسی متالورژی و مواد، پردیس دانشکده‌های فنی دانشگاه تهران
3 - استاد، دانشکده مهندسی متالورژی و مواد، پردیس دانشکده‌های فنی دانشگاه تهران

Received: 2016-06-20 Accepted : 2016-06-20 Published : 2016-05-21

Keywords: SiC, Friction Stir Processing, Hybrid Nano-Composite, BN, 7075 Al,

Abstract :

Friction stir processing technique was carried out to produce a 7075Al/SiC-BN hybrid nano-composite surface layer on 7075 Al substrate in order to improve hardness and wear resistance. Equal weight ratios of micron-sized SiC and nano-sized BN powder were placed in a groove in the front side of the rotating and advancing tool. In order to achieve homogeneity, five additional passes were carried out. Microscopic investigations showed near uniform distribution of the particles in a matrix of ultra-fine Al grains of less than 1mm. The micro hardness and wear resistance of the friction stir processed substrate (without introduction of SiC and BN powder) and fabricated 7075Al/SiC-BN hybrid nano-composite layer were found to be markedly lower than those of the as–received 7075Al-T6 due to dissolution of 7075Al-precipitates during thermo-mechanical regime of the process. However, these were found to increase to about one third over those of the as-received 7075Al-T6 substrate after subsequent T6 heat treatment of the fabricated hybrid nano-composite layer. Such treatment was associated with the formation of intermetallic-based precipitates.

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